When it comes to the most luxurious apartments in top city centres, the only way is up.
At least that is the opinion of a number of property developers who are wooing the ultra wealthy with lavishly-appointed skyscrapers in the most prestigious of neighbourhoods, where large-scale lateral square footage is nearly impossible to find.
As well as being designed by top architects and interior designers, these luxury trophies have the added benefit of being zero-maintenance, turnkey properties.
"Wealthy buyers want convenience," said Joanna Leverett, head of international new developments at Savills. "Flagship developments provide services and facilities such as spas, wellness and restaurants that you wouldn't normally get in a house, all within walking distance to the city's restaurants and culture instead of being out in the sticks."
This type of apartment is easier on the rent and resale market too, said Edward de Mallet Morgan, head of super prime international property at Knight Frank. "More owners are renting out their properties where there is a good management, rental service or a concierge, as it is nice to have some income being generated to put towards annual running costs," he said.
Here Wealth-X takes a look at the world's ten most luxurious high rise apartment blocks for ultra high net worth (UHNW) individuals, as well as the UHNW developers behind them.
1. One Hyde Park
Average Price Per Square Foot: US$9,906 (S$12,475)
Penthouse: US$226.9 million (S$285.8 million)
Trophy Credentials: The signature development of the Candy Brothers, One Hyde Park is probably London's most hotly-discussed residential building. Candy & Candy say the penthouse sold for £136.4 million (US$226.9 million), although reports have suggested the actual price was lower. Christian Candy is listed as an owner along with financial backer Sheik Hamad bin Jassim bin Jaber Al Thani.
There's plenty to keep residents entertained, including the golf-simulator, private cinema and squash court. With architectural design by the pre-eminent Roger Stirk Harbour + Partners, Candy & Candy did the interiors and Mandarin Oriental Hotel group runs the concierge.
Agents: Savills, Aylesford, Strutt & Parker